21.5 cm. Up for anything. Grease/soak proof. Cut-resistant. Microwavable. Solo Paper Plates are: strong and stylish to serve any occasion; soak and grease proof; cut-resistant; microwavable (Microwave usage: limited re-heating of food only); compostable (Compostable only in commercial composting facilities, which may not exist in your area. Not suitable for backyard composting). Look for other coordinating Solo products to complete the set! Visit us at: www.solocup.com. Questions? 1-877-Solonow.